<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" :checked="ifCheck" @change="checkOrUncheck" />
    </label>
    <span>
      <span>已完成{{ taskDoneCount }}</span> / 全部
      {{ allTaskNum }}
    </span>
    <button class="btn btn-danger" @click="deleteDoneTask">
      清除已完成任务
    </button>
  </div>
</template>

<script>
export default {
  name: "TaskFooter",
  props: ["taskArray", "checkOrUncheckTask","deleteTaskByDone"],
  computed: {
    taskDoneCount() {
      let count = 0;
      this.taskArray.forEach((task) => {
        if (task.done) count++;
      });
      return count++;
    },
    allTaskNum() {
      return this.taskArray.length;
    },

    ifCheck() {
      return this.doneTaskNum === this.allTaskNum;
    },
  },
  methods: {
    checkOrUncheck(e) {
       this.checkOrUncheckTask(e.target.checked);
    },
    deleteDoneTask(){
         this.deleteTaskByDone();
    }
  },
};
</script>

<style>
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}

li:hover {
  background-color: antiquewhite;
}

li:hover button {
  display: block;
}
</style>